Menno Simons

Menno Simons (1496–1561) was one of the most famous Anabaptists in the modern Netherlands. His followers became known as Mennonites, and still carry on today. Menno began as a Roman Catholic priest, but came to reject Transubstantiation, infant baptism, and all use of force, spurred on by the murder of his brother Pieter, who was already an Anabaptist.

You can read the full text of Menno's major work, A Foundation and Plain Instruction of the Doctrine of our Lord Jesus Christ, at Google Books.